Procedure
cake:
Preheat the oven to 350 degrees F.
In a small saucepan, warm the milk and 2 teaspoons of the butter together
over medium-low heat.
With an electric mixer fitted with a wire whip, beat the eggs and 1 cup
of the sugar on medium-high speed in a large mixing bowl until the mixture is pale
yellow, thick, and tripled in volume, about 8 minutes.
With the mixer on low speed, beat in the warm milk mixture.
Sift the flour, cocoa, baking powder, and salt into a small mixing bowl.
Add half the flour mixture to the egg mixture and blend thoroughly until
smooth.
Repeat with the other half.
Add the vanilla and mix gently.
Grease 2 8" round pans with the remaining 2 tablespoons butter.
Sprinkle evenly with the remaining 2 tablespoons sugar.
Pour the cake batter into the pan, spreading it evenly.
Bake until the cake springs back when touched, about 15 minutes.
Cool for about 2 minutes, then gently flip it out onto a large sheet of
parchment paper.
Let cool completely.